Rotary steam-engine



(No Model.)

G. H. WESTON. ROTARY STEAM ENGINE. 5451.9 No. 426,553. Patented Apr. 29, 1890.

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ROTARY STEAM-meme.

SPECIFICATION forming part of Letters Patent No. 426,553, dated April 29, 1890.

Application filed July 23, 1889. Serial No. 318,352. (No model.) n

Be it known that I, GEORGE H. WESTON, of Boston, county of Suffolk, State of Massaohusetts, have invented an Improvement in Rotary Steam-Engines, of which the following description, in connection with the acletters on the drawings representing like parts.

`This invention relates to rotary engines, and 1s an improvement upon the engine shown and described in another application, Serial NoQp/Llt, filed by me Novem-ber 27, 1888, and has for its object to improve the construction of the same.

One feature of my present invention consists in providing between the abutment and the bearing for the shaft of the said abutment a steam space or chamber into which steam is admitted to eect a counterbalance of pressurfeLof the steam admitted through the piston-valve, thereby relieving the bear- 1n gs from pressure and diminishing the Wear upon the same, and as a result prolonging the life of the engine. Another feature of my invention consists 1n providing the piston-valve with an annular flange to increase the strength of the said valve, and with an inlet-port of increased area, by which a larger amount of steam may be admitted through the port to act on the abutment, as will be described.

The particular feature in Which my invention consists will be pointed out in the claims at the end of this speci .fication Figure l is a transverse section of .a rotary engine embodying my invention, the section being supposed to be taken on line Fig. 2 Fig. 2, asection o'f the'engine shown in Fig. l on the line w.

Referring to Fig. 2, the cylindrical case A is provided With the bearings a. a', the bearing a being extended into the case and having mounted upon it the abutment a2, located in the said case, and the cover a3, secured to the said case in any. suitable manner, substantially as-shown and described in the application 'referred to. The abutment 0.2 is detachably secured, as byv screw a4, to an enlarged head a5, secured to or forming part of the shaft a, extending through the sleeve a?,

(herein shown as made conical near its inner end,) to fit upon a conically-shaped portion of the shaft a, (marked 2.) The shaft 0,6 is coupled by gears a8 a, as in the application 55 referred to, to the shaft am of the piston-valve (L12, detachably secured, as by screw a, to the enlarged head am of the said shaft. The shaft am is extended through a sleeve' Z), provided with a conieally-shaped end to fit the coni- 6o cally-shaped portion of the shaft am, (marked The sleeve '(2 is inserted through the extended bearing a', and is surrounded by a suitable packing-ring b2.

The piston-valve L12 Aon its inner'end, as 65 herein shown, Ais provided with an annular flange b3, fitted into a recess on the inner side of the cylindrical case A, and at its opposite end the said piston-valve is provided with an extension b4, preferably made bevel-shaped, 7o as shown in Fig. 2, the said extension being projected into a recess in the cap a3 to Obtain a larger lpiston-valve, so that the inlet-port b5 (indicated by dotted lines, Fig. 2, and full lines, Fig. l) may be made larger tl an shown in United States Patent No. 392 o3, granted to me November 13, lSSS. The piston-valve am has eo-operating with it the cut-off D7, substantially asin the application referred to, and the said valve is provided with the arm 8c Z120, extended into the re-entrant portion of the abutment. The steam enters by the port be and passes through the cut-out and through the port b5 into the re-entering portion b9 of the abutment, and in Order to oounterbalanee 8 5` the pressure of steam upon the re-ontering portion of the abutment, and thereby diminish the wear upon the bearings of the said abutment and its shaft, an annular channel is out in the bearing a Within the case A, to 9o form a chamber c, into which steam is admitted through the port of in the case A, the said port being connected by a pipe .(not shown) to the steam-supply pipe, or, if desired, to any other source of supplyof steam. Thel flange b3 on the piston-valve L12 adds increased strength to the said valve, so that the engine may be run a much longer time than if the said flange were dispensed with.

If it is desired to renew the shafts a6 d10- rco as, for instance, for the purpose of truing the" same-they may readily be detached from AMBER im.

the abutment and the piston-vaive by removing thescrews a4 al, the cover a being removed.

I prefer to make the shafts a. am conical at the parts marked 2 3, as it will readily be seen that by driving the sleeves a7 Z) farther into the case the bearing for the shaft may always be tight.

I claiml. In arotary engine, the combination, with an inclosing-case provided with bearings, of an abutment, a shaft for said abutment, an independent hollow piston-valve, and a shaft for said piston-valve provided with a' flange to Whichthe said .piston-valve is detaehably secured, substantially as described.

2. In a rotary engine, the combination, with an inelosing-ease fitted with an extended bearing, of a revolving abutment mounted upon said bearing and provided with a reentrant portion b9, an annular channel c on the outside of the said bearing between it and the said revolving abutment, a piston` valve having an arm to enter said re-entrant,

GEORGE I-I. WESTON. Vitnesses:

JAS. H. CHURCHILL, EMMA J. BENNETT. 

